Scroll compressor

ABSTRACT

A scroll compressor includes a partition plate 20, a refrigerant intake tube 13 and a straightening plate 160, and a shielding plate 180 is provided at a height position between the partition plate 20 and an intake portion 38 of a fixed scroll 30. According to this, refrigerant sucked from the refrigerant intake tube 13 flows toward the partition plate 20 by the straightening plate 160, the refrigerant which flows toward the partition plate 20 collides against the shielding plate 180 before it is sucked by a compression mechanism 170 and therefore, it is possible to prevent refrigerant from coming into contact with the partition plate 20 having high temperature. According to this, the refrigerant is not heated by the partition plate 20, volumetric efficiency is enhanced and high efficiency of the compressor can be realized.

TECHNICAL FIELD

The present invention relates to a scroll compressor.

BACKGROUND TECHNIQUE

Conventionally, there is known a hermetic type scroll compressor in which a compressing element having a fixed scroll and an orbiting scroll placed in a partitioned low-pressure space and a motor for orbiting and driving the orbiting scroll are disposed by providing a partition plate in an airtight container.

According to the hermetic type scroll compressor of this kind, refrigerant is introduced into the low-pressure space the an airtight container through a refrigerant intake tube. At that time, the refrigerant collides against an intake baffle provided in the low-pressure space, and the refrigerant after collision flows into a compressing element. It is disclosed that the refrigerant which is compressed by the compressing element is discharged into a high-pressure space partitioned by the partition plate through a discharge port of the fixed scroll (see patent document 1 for example).

PRIOR ART DOCUMENT Patent Document

[Patent Document 1] Japanese Patent Application Laid-open No.H4-255595

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

However, according to the conventional configuration, since the refrigerant collides against the intake baffle, a flowing direction of the refrigerant which flows out from the intake baffle becomes parallel to a rotation shaft of the motor, i.e., becomes a vertically upward direction. Therefore, refrigerant which flows out from the intake baffle toward an opposite side of the motor collides against the partition plate placed on a side above the compressing element.

Since the partition plate is in contact with the high-pressure space, the partition plate is in a high-temperature state. Hence, since the refrigerant comes into contact with the partition plate and is heated, there is a problem that density of the refrigerant which is sucked into the compressing element is lowered, and volumetric efficiency is deteriorated.

The present invention solves the conventional problem, and it is an object of the invention to provide a scroll compressor which can enhance the volumetric efficiency.

Means for Solving the Problem

To solve the conventional problem, the present invention provides a scroll compressor including: a partition plate for dividing an interior of an airtight container into a high-pressure space and a low-pressure space; a fixed scroll which is adjacent to the partition plate; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber; a rotation-suppressing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll; in which the fixed scroll, the orbiting scroll, the rotation-suppressing member and the main bearing are placed in the low-pressure space, and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing, wherein a refrigerant intake tube for making the low-pressure space suck refrigerant is provided in the airtight container, and the scroll compressor includes a straightening plate against which refrigerant introduced from the refrigerant intake tube collides, and a shielding plate provided at a height position between the partition plate and an intake portion of the fixed scroll.

According to this, since the sucked refrigerant does not come into direct contact with the partition plate, the refrigerant is not heated by the partition plate, it is possible to suppress the reduction of the suction density and an enhancing effect of the volumetric efficiency can be obtained.

Effect of the Invention

According to the present invention, it is possible to provide a scroll compressor having enhanced volumetric efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(a) is a vertical sectional view showing a configuration of a scroll compressor according to a first embodiment of the present invention;

FIG. 1(b) is a sectional view a fixed scroll shown in FIG. 2(a) as viewed from above;

FIG. 2 is a perspective view of a member in which a straightening plate and a shielding plate of the scroll compressor in the first embodiment of the invention are integrally formed together;

FIG. 3(a) is a vertical sectional view showing a configuration of a scroll compressor according to another embodiment of the invention; and

FIG. 3(b) is a sectional view of a fixed scroll shown in FIG. 3(a) as viewed from above.

MODE FOR CARRYING OUT THE INVENTION

A first aspect provides a scroll compressor including: a partition plate for dividing an interior of an airtight container into a high-pressure space and a low-pressure space; a fixed scroll which is adjacent to the partition plate; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber; a rotation-suppressing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll; in which the fixed scroll, the orbiting scroll, the rotation-suppressing member and the main bearing are placed in the low-pressure space, and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing, wherein a refrigerant intake tube for making the low-pressure space suck refrigerant is provided in the airtight container, and the scroll compressor includes a straightening plate against which refrigerant introduced from the refrigerant intake tube collides, and a shielding plate provided at a height position between the partition plate and an intake portion of the fixed scroll.

According to this, the sucked refrigerant is not heated by the partition plate, reduction in intake density can be suppressed and an enhancing effect of volumetric efficiency can be obtained.

Ina second aspect, especially in addition to the first aspect, the shielding plate is provided on an inner wall of the airtight container.

According to this, vibration of the shielding plate can be reduced, heat conduction from the fixed scroll can be reduced, and it is possible to efficiently introduce refrigerant into the compression chamber without heating the refrigerant.

In a third aspect, especially in addition to the first aspect, the shielding plate is provided in the fixed scroll.

According to this, it is possible to easily fix the shielding plate to the fixed scroll by a bolt or the like.

In a fourth aspect, especially in addition to the first to third aspects, the shielding plate covers an upper opening of the straightening plate and covers an opening range of the intake portion of at least the fixed scroll.

According to this, the sucked refrigerant can once collide against the shielding plate and the refrigerant can smoothly flow into the intake portion of the fixed scroll. Therefore, the sucked refrigerant is not heated by the partition plate and reduction in density of the sucked refrigerant can be suppressed, resistance of a flowing passage of the fixed scroll into the intake portion is low and therefore, the efficient enhancing effect can be obtained.

In a fifth aspect, especially in addition to the first to fourth aspects, the straightening plate and the shielding plate are integrally formed together.

According to this, the shielding plate can be placed at a position where refrigerant which flows out from the straightening plate reliably collides.

Embodiments of the present invention will be described with reference to the drawings. The invention is not limited to the embodiments.

First Embodiment

FIG. 1(a) is a vertical sectional view of a scroll compressor according to a first embodiment. A vertical direction in the embodiments of the present invention is a Z-axial direction in the drawings.

As shown in FIGS. 1, a compressor 1 includes, as an outer shell, a cylindrical airtight container 10 having a longitudinal direction extending in the vertical direction.

The compressor 1 is a hermetic type scroll compressor including, in the airtight container 10, a compression mechanism 170 which compresses refrigerant and a motor 80 for driving the compression mechanism 170. The compression mechanism 170 is composed of at least a fixed scroll 30, an orbiting scroll 40, a main bearing 60 and an Oldham ring 90.

A partition plate 20 for vertically partitioning an interior of the airtight container 10 is provided in the airtight container 10 at a high location. The partition plate 20 divides the interior of the airtight container 10 into a high-pressure space 11 and a low-pressure space 12. The high-pressure space 11 is a space filled with high pressure refrigerant after the refrigerant is compressed by the compression mechanism 170. The low-pressure space 12 is a space filled with low pressure refrigerant before the refrigerant is compressed by the compression mechanism 170.

The airtight container 10 includes a refrigerant intake tube 13 which brings outside of the airtight container 10 and the low-pressure space 12 into communication with each other, and a refrigerant discharge tube 14 which brings the outside of the airtight container 10 and the high-pressure space 11 into communication with each other. The compressor 1 introduces low pressure refrigerant from a refrigeration cycle circuit (not shown) provided outside the airtight container 10 into the low-pressure space 12 through the refrigerant intake tube 13. High pressure refrigerant compressed by the compression mechanism 170 is first introduced into the high-pressure space 11. Thereafter, the high pressure refrigerant is discharged from the high-pressure space 11 into the refrigeration cycle circuit through the refrigerant discharge tube 14.

An oil reservoir 15 in which lubricant oil is stored is formed in a bottom of the low-pressure space 12.

The compressor 1 includes the fixed scroll 30 and the orbiting scroll 40 in the low-pressure space 12. The fixed scroll 30 is a non-orbiting scroll. The fixed scroll 30 is placed below the partition plate 20 in adjacent thereto. The orbiting scroll 40 is placed below the fixed scroll 30 such that the orbiting scroll 40 meshes with the fixed scroll 30.

The fixed scroll 30 includes a disk-shaped fixed scroll end plate 31 and a spiral-shaped fixed spiral lap 32 which stands on a lower surface of the fixed scroll end plate 31. The orbiting scroll 40 includes a disk-shaped orbiting scroll end plate 41, a spiral-shaped orbiting spiral lap 42 standing from an upper surface of the orbiting scroll end plate 41, and a lower boss portion 43. The lower boss portion 43 is a cylindrical projection which is formed at a substantially central portion of a lower surface of an orbiting scroll end plate 41.

By meshing the orbiting spiral lap 42 of the orbiting scroll 40 and the fixed spiral lap 32 of the fixed scroll 30 with each other, a compression chamber 50 is formed between the orbiting scroll 40 and the fixed scroll 30. The compression chamber 50 is formed on an inner wall side and an outer wall side of the orbiting spiral lap 42. The main bearing 60 which supports the orbiting scroll 40 is provided below the fixed scroll 30 and the orbiting scroll 40. The orbiting scroll 40 is placed between the fixed scroll 30 and the main bearing 60. A bearing portion 61 is formed on a central portion of the main bearing 60, and the main bearing 60 is fixed to an inner wall of the airtight container 10.

A rotation shaft 70 has a longitudinal direction extending in the vertical direction in FIG. 1. One end of the rotation shaft 70 is pivotally supported by the bearing portion 61, and the other end of the rotation shaft 70 is pivotally supported by an auxiliary bearing 16. The auxiliary bearing 16 is a bearing provided below the low-pressure space 12, preferably in the oil reservoir 15. An upper end of the rotation shaft 70 is provided with an eccentric shaft 71 which is eccentric with respect to an axis of the rotation shaft 70. The eccentric shaft 71 is slidably inserted into the lower boss portion 43 through a swing bush 78 and a slewing bearing 79. The lower boss portion 43 is orbited and driven by the eccentric shaft 71.

An oil passage 72 through which lubricant oil passes is formed in the rotation shaft 70. The oil passage 72 is a through hole formed in an axial direction of the rotation shaft 70. One end of the oil passage 72 opens into the oil reservoir 15 as a suction port 73 provided in a lower end of the rotation shaft 70. A paddle 74 for pumping lubricant oil from the suction port 73 into the oil passage 72 is provided in an upper portion of the suction port 73.

The rotation shaft 70 is connected to the motor 80. The motor 80 is placed between the main bearing 60 and the auxiliary bearing 16. The motor 80 includes a stator 81 fixed to the airtight container 10, and a rotor 82 placed inside the stator 81.

A rotation-suppressing member (Oldham ring) 90 is provided between the orbiting scroll 40 and the main bearing 60. The Oldham ring 90 prevents the orbiting scroll 40 from rotating. According to this, the orbiting scroll 40 orbits without rotating with respect to the fixed scroll 30. As the rotation-suppressing member 90, it is also possible to use mechanisms disclosed in JP1984-58188A, JP1985-104787A, JP1990-140483A, JP1994-330870A, JP1996-74754A, JP2003-201977A and JP1999-148473A in addition to the Oldham ring.

The fixed scroll 30, the orbiting scroll 40, the motor 80, the Oldham ring 90 and the main bearing 60 are placed in the low-pressure space 12. The fixed scroll 30 and the orbiting scroll 40 are placed between the partition plate 20 and the main bearing 60.

The partition plate 20 and the main bearing 60 are fixed to the airtight container 10. At least one of the fixed scroll 30 and the orbiting scroll 40 provided with an elastic body (not shown) is axially movably provided in at least a portion between the partition plate 20 and the main bearing 60, more specifically between the partition plate 20 and the orbiting scroll 40, or between the fixed scroll 30 and the main bearing 60.

A straightening plate 160 is provided between the refrigerant intake tube 13 and the intake portion 38 of the compression mechanism 170. The straightening plate 160 is placed at a position opposed to a suction port of the refrigerant intake tube 13. By placing the straightening plate 160 at the position opposed to the suction port of the refrigerant intake tube 13, an upper opening 160 a is formed above the straightening plate 160 on the side of the refrigerant intake tube 13, and a lower opening 160 b is formed below the straightening plate 160 on the side of the refrigerant intake tube 13.

Motion and action of the compressor 1 will be described. By driving the motor 80, the rotation shaft 70 rotates together with the rotor 82. By the eccentric shaft 71 and the Oldham ring 90, the orbiting scroll 40 orbits around a center axis of the rotation shaft 70 without rotating. According to this, a volume of the compression chamber 50 is reduced, and refrigerant in the compression chamber 50 is compressed.

The refrigerant is introduced from the refrigerant intake tube 13 into the low-pressure space 12. Then, the refrigerant which is introduced into the low-pressure space 12 collides against the straightening plate 160, and split-flows in a direction of the partition plate 20 and in a direction of the motor 80. The refrigerant which collides against the straightening plate 160 changes its flowing direction, and flows from the upper opening 160 a toward the partition plate 20, and flows from the lower opening 160 b toward the motor 80.

The refrigerant which split-flows in the direction of the partition plate 20 is sucked by the compression chamber 50, and the refrigerant which is compressed by the compression chamber 50 is discharged from the refrigerant discharge tube 14 through the high-pressure space 11.

In this embodiment, a shielding plate 180 is provided at a height position between the intake portion 38 of the fixed scroll 30 and the partition plate 20.

According to this, the refrigerant which is introduced from the refrigerant intake tube 13 split-flows by the straightening plate 160 and flows toward the partition plate 20, but since the shielding plate 180 is provided at the height position between the intake portion 38 of the fixed scroll 30 and the partition plate 20, and the refrigerant is introduced by the compression chamber 50 without colliding against the partition plate 20 whose temperature becomes relatively high.

Hence, the sucked refrigerant is not heated by the partition plate 20, reduction in refrigerant density can be suppressed, and efficiency enhancing effect of the compressor can be obtained.

The shielding plate 180 can be provided inside the airtight container 10. By mounting the shielding plate 180 in the airtight container 10, vibration of the shielding plate can be reduced, and heat conduction from the fixed scroll 30 can also be reduced. Therefore, it is possible to efficiently introduce the refrigerant into the compression chamber 50 without heating the refrigerant.

In this embodiment, the shielding plate 180 may integrally be formed together with the straightening plate 160 as shown in FIG. 2. The straightening plate 160 is held by a pair of side plates 160 c, and mounting materials 160 d are connected to the pair of side plates 160 c, respectively. The straightening plate 160 is placed at a position separated away from the suction port of the refrigerant intake tube 13 by a predetermined distance by the pair of side plates 160 c, and the straightening plate 160 is mounted on an inner wall of the airtight container 10 by the mounting materials 160 d. The shielding plate 180 is formed on upper ends of the pair of side plates 160 c. A space is famed between the pair of side plates 160 c, a space between lower ends of the pair of side plates 160 c is opened, and a space between rear ends (ends thereof on the side of airtight container) of the pair of side plates 160 c is opened. The space between rear ends (ends thereof on the side of airtight container) of the pair of side plates 160 c maybe opened at least at a position of the suction port of the refrigerant intake tube 13. In a state where the straightening plate 160 is mounted on the airtight container 10, the straightening plate 160 is opposed to the suction port of the refrigerant intake tube 13. A space between the upper end of the straightening plate 160 and a front end (end opposite to airtight container) of the shielding plate 180 is opened and is placed at a position opposed to the intake portion 38 of the compression mechanism 170.

The straightening plate 160, the side plates 160 c, the mounting materials 160 d and the shielding plate 180 may be formed from one plate material, but they may integrally formed together by bonding at least any of the straightening plate 160, the side plates 160 c, the mounting materials 160 d and the shielding plate 180.

According to this, since the shielding plate 180 and the straightening plate 160 are integrally formed together, the shielding plate 180 can be placed at a position where refrigerant which flows out from the straightening plate 160 reliably collides against the shielding plate 180, and the shielding plate 180 can easily be placed on the inner wall of the airtight container 10.

FIG. 3(a) is a vertical sectional view of a scroll compressor according to another embodiment of the invention. The same symbols are allocated to the same members as those shown in FIGS. 1, and description thereof will be omitted.

As shown in FIGS. 3, the shielding plate 180 can be provided on the fixed scroll 30.

According to this, the shielding plate 180 can easily be fixed without welding the shielding plate 180 to the fixed scroll 30 through a bolt or the like.

In this embodiment, the shielding plate 180 is placed at the upper side opposed position of the upper opening 160 a of the straightening plate 160 as shown in FIGS. 1 (b) and 3 (b) . According to this, the upper opening 160 a of the straightening plate 160 is covered.

The shielding plate 180 is placed at a position covering an opening range r in a radial direction in the intake portion 38 of at least the fixed scroll 30 from above, and is placed at a position covering an opening range θ in the radial direction from above.

According to this, suction refrigerant which split-flows by the straightening plate 160 and flows into the low-pressure space 12 from the upper opening 160 a of the straightening plate 160 collides against the shielding plate 180 provided to cover the upper opening 160 a of the straightening plate 160 and then, the refrigerant smoothly flows into the intake portion 38 of the fixed scroll 30. Therefore, the refrigerant is not heated by the partition plate 20 whose temperature becomes relatively high. Therefore, reduction in density of the suction refrigerant can be suppressed, resistance of the flowing passage into the intake portion 38 of the fixed scroll 30 is small, the refrigerant can flows into the intake portion 38 and therefore, the efficiency enhancing effect can be obtained.

INDUSTRIAL APPLICABILITY

The scroll compressor of the present invention is useful for a compressor of a refrigeration cycle apparatus, and the scroll compressor can be applied to electrical products such as a hot water supplying system, a hot-water heating system and an air conditioner.

EXPLANATION OF SYMBOLS

-   1 compressor -   10 airtight container -   11 high-pressure space -   12 low-pressure space -   13 refrigerant intake tube -   14 refrigerant discharge tube -   15 oil reservoir -   16 auxiliary bearing -   20 partition plate -   30 fixed scroll -   31 fixed scroll end plate -   32 fixed spiral lap -   38 intake portion -   40 orbiting scroll -   41 orbiting scroll end plate -   42 orbiting spiral lap -   43 lower boss portion -   50 compression chamber -   60 main bearing -   61 bearing portion -   70 rotation shaft -   71 eccentric shaft -   72 oil passage -   73 suction port -   74 paddle -   78 swing bush -   79 slewing bearing -   80 motor -   81 stator -   82 rotor -   90 rotation-suppressing member (Oldham ring) -   160 straightening plate -   160 a upper opening -   160 b lower opening -   160 c side plates -   160 d mounting materials -   180 shielding plate 

1. A scroll compressor comprising: a partition plate for dividing an interior of an airtight container into a high-pressure space and a low-pressure space; a fixed scroll which is adjacent to the partition plate; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber; a rotation-suppressing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll; in which the fixed scroll, the orbiting scroll, the rotation-suppressing member and the main bearing are placed in the low-pressure space, and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing, wherein a refrigerant intake tube for making the low-pressure space suck refrigerant is provided in the airtight container, and the scroll compressor includes a straightening plate against which refrigerant introduced from the refrigerant intake tube collides, and a shielding plate provided at a height position between the partition plate and an intake portion of the fixed scroll.
 2. The scroll compressor according to claim 1, wherein the shielding plate is provided on an inner wall of the airtight container.
 3. The scroll compressor according to claim 1, wherein the shielding plate is provided in the fixed scroll.
 4. The scroll compressor according to claim 1, wherein the shielding plate covers an upper opening of the straightening plate and covers an opening range of the intake portion of at least the fixed scroll.
 5. The scroll compressor according to claim 1, wherein the straightening plate and the shielding plate are integrally formed together. 